docs: def validate(self):
          """Perform some basic configuration validation.
          """
          if not self.conf.get('auth_token'):
              raise PacketManagerException('The auth token for Packet is not defined but required.')
          if not self.conf.get('projects'):
              raise PacketManagerException('Required "projects" section is missing.')
  
          projects = self.conf.get('projects')
          if not projects.keys():
              raise PacketManagerException('At least one project at Packet is required.')
  
          failure = False
          for project, identifier in projects.items():
              if not identifier:
                  failure = True
                  logging.error('Project "%s" has no valid identifier.', project)
          if failure:
              raise PacketManagerException('One or more projects are not setup appropriately.')